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Few of existing works on power reduction in 3D ICs discuss the ability of supply voltage scaling techniques for power optimization. In this work, a supply voltage assignment based method for minimizing the power consumption of 3D ICs is presented. The proposed approach includes three major headings: (1) 3D IC Voltage Assignment for power reduction with including three factors-sensitivity, proximity effect and level shifter (LS) budget; (2) 3D Electro-Thermal Analysis for the temperature distribution of 3D IC; (3) Thermal Aware Static Timing Analysis for thermal-related delay values of functional gates. The experimental results have shown a great power reduction by the proposed method.